Cationic Azine Laundry Composition for Polycotton Whiteness Control
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Solution Overview
Problem
Existing dye systems for enhancing whiteness in fabrics, particularly polyester-cotton blends, face challenges with poor deposition on polyester garments and excessive deposition on cotton, leading to unacceptably large blueing or dulling effects.
Innovation Solution
The use of selected cationic azine dyes with specific structural characteristics, which are substantive to both cotton and polyester fabrics, providing effective whiteness improvement with minimal dulling and no build-up, incorporated into a laundry treatment composition that includes surfactants, fluorescers, and optional acid azine dyes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If cationic azine dyes are used to improve deposition on polycotton, then whiteness improvement is achieved, but excessive deposition on cotton may cause unacceptably large blueing
Solution Approach 1:
The patent applies local quality by formulating a laundry composition containing multiple components (cationic azine dye, surfactant, fluorescer, builders) that work together to achieve selective deposition. The cationic azine dye deposits on polycotton to provide whiteness improvement, while the combination with surfactants and fluorescers ensures that cotton garments receive adequate treatment without excessive blueing or dulling
Solution Approach 2:
The patent uses a composite laundry treatment composition combining cationic azine dye with surfactants, fluorescers, and builders. This composite approach allows the system to achieve multiple functions simultaneously: the cationic azine dye provides deposition on polycotton, the surfactant aids in uniform distribution, and the fluorescer enhances whiteness perception, thereby preventing excessive blueing on cotton while maintaining fabric appearance
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The cationic azine dyes achieve high deposition on polyester-cotton blends with minimal impact on cotton, offering improved whiteness without fabric dulling and no build-up over multiple washes, maintaining fabric appearance.
Implementation Method 1
Selected cationic azine dyes have a high substantivity to polycotton whilst depositing well on cotton
Implementation Method 2
from 2 to 70 wt % of a surfactant
Implementation Method 3
from 0.005 to 2 wt % of a fluorescer
Data Source
AI summary
The present invention provides a laundry treatment composition comprising a cationic azine dye.